# Copyright 2017 Neural Networks and Deep Learning lab, MIPT
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import re


spaces_pat = re.compile(r"\s+")
special_symb_pat = re.compile(r"[^a-zа-я0-9 ]", re.IGNORECASE)


def clean_text(text):
    return special_symb_pat.sub("", spaces_pat.sub(" ", text.lower())).strip()
